7 results about "Peroxydisulfate" patented technology

The invention relates to a water treatment and membrane separation technology, and provides an integrated catalytic separation membrane, a preparation method thereof, and a water treatment method and system. According to the membrane, polyvinylidene fluoride is used as a continuous phase to form a porous matrix, and cerium dioxide is embedded and fixed in a mode of uniform dispersion in a membrane body in a phase inversion membrane forming process; in the presence of illumination and peroxysulfate, active species are generated through in-situ activation on a membrane-water interface, and membrane separation is completed synchronously. The water treatment method comprises the following steps: adding peroxymonosulfate or peroxydisulfate into a water body to be treated, and filtering through the membrane under illumination; the photothermal effect generated by organic matter degradation intermediates in operation inhibits membrane pollution and maintains flux. According to the invention, short-range coupling of active sites and mass transfer channels is realized, the medicament and energy utilization rate is improved, the coating stripping and metal dissolution risk is reduced, and the method is suitable for drinking water pretreatment, reclaimed water deep treatment and treatment of water containing natural organic matters / humic acid.

This invention provides a method for preparing sulfated polysaccharides suitable for the production of microcapsules. [Solution] The present invention relates to a method for preparing sulfated polysaccharides. A mixture comprising at least one polysaccharide and at least one polar aprotic solvent is prepared in this method. At least one sulfating agent, at least one acetylating agent, and at least one peroxydisulfate are added to the mixture, and the mixture is then subjected to a temperature treatment so that at least one polysaccharide is converted to at least one sulfated acetate polysaccharide. At least one sulfated acetate polysaccharide is separated from the mixture and converted to a sulfated polysaccharide. The present invention further relates to sulfated polysaccharides that can be prepared using the method according to the present invention. The present invention further relates to microcapsules and methods for producing microcapsules.

The application belongs to the technical field of resource utilization of medicinal residue, and particularly relates to a method for selectively extracting cellulose from medicinal residue by oxidation. The method for selectively extracting cellulose from medicinal residue by oxidation provided in the application can efficiently extract cellulose from medicinal residue waste in one step, and realize harmless disposal and resource utilization of medicinal residue waste. The application uses medicinal residue waste as raw material, does not need any pretreatment, removes non-cellulose plant components based on one-step oxidation of potassium peroxydisulfate, efficiently and selectively extracts cellulose, and the purity of the extracted cellulose is as high as 95%. In the application, potassium peroxydisulfate as a strong oxidant degrades the amorphous region of medicinal residue waste, avoiding the removal of non-cellulose plant components by pretreatment. The method provided in the application does not involve toxic or costly chemical reagents, is simple in steps, short in time consumption, low in energy consumption, small in wastewater production, low in COD value, and realizes the recycling of cellulose.

The preparation method comprises the following steps: by taking starch, glucose or cellulose as a carbon source, imidazole or phenanthroline as a nitrogen source and mixed inorganic salt as a pore-foaming agent, carrying out ball-milling mixing, pre-carbonization, carbonization, washing and drying to prepare a nitrogen-containing micropore-mesoporous carbon material with super-large mesopores; the material contains a cross-linked microporous / mesoporous carbon structure, the mesoporous aperture is 3.7-28.3 nanometers, and the micropore aperture is 0.53-0.56 nanometers. The micropore-mesopore coexistence structure is beneficial to adsorption of phenol molecules and desorption of products; nitrogen, carbon and oxygen elements are uniformly distributed, the nitrogen element exists in forms of pyridine nitrogen, graphite nitrogen and pyrrole nitrogen and can efficiently catalyze potassium peroxydisulfate to generate hydroxyl free radicals, singlet oxygen and sulfate anion free radicals, and phenol is efficiently degraded. According to the method, no mesoporous silicon template agent is used, the steps are few, and the preparation cost is low; and the nitrogen content, the specific surface area, the mesoporous volume and the mesoporous aperture can be regulated and controlled.

A semiconductor process wastewater treatment system and a method for treating semiconductor process wastewater using the system are disclosed. The disclosed semiconductor process wastewater treatment system comprises: an advanced oxidation reaction tank for advanced oxidation of a semiconductor process wastewater comprising tetramethyl ammonium hydroxide (TMAH) using a UV / PDS process that activates peroxydisulfate (PDS) with ultraviolet light (UV ray); an anaerobic biological reaction tank for biologically treating the semiconductor process wastewater that has passed through the advanced oxidation reactor, the anaerobic biological reaction tank configured to treat the semiconductor process wastewater with microorganisms comprising sulfate reducing bacteria (SRB) under anaerobic conditions, and configured to react sulfate generated in the advanced oxidation reactor with the sulfate reducing bacteria to generate H2S; and a gas separator for separating the H2S from gas generated in the anaerobic biological reactor.

The invention describes a process for producing soluble salts of 5,5-azotetrazole (5,5-AT) by oxidation of 5-aminotetrazole with a soluble peroxodisulfate in a strongly alkaline environment. This compound is a precursor of the energetic component of non-toxic priming mixtures, 5,5- bis-hydrazino-tetrazole (BTH). BTH can be prepared by reduction of salts or solutions of 5,5-AT with ascorbic acid. 5,5-AT

The invention belongs to the technical field of industrial solid waste resource utilization and wastewater treatment, and particularly relates to polyacrylamide modified iron mud biochar as well as a preparation method and application thereof. According to the invention, iron mud is used as a raw material, polyacrylamide is used as a flocculant and a slow-release nitrogen source at the same time, and the nitrogen-doped iron mud biochar is prepared through hydrothermal reaction and oxygen-limited pyrolysis. The material has a porous sheet layer and a core-shell structure, and zero-valent iron nanoparticles are tightly coated by a carbon shell. When being used as a catalyst for activating peroxydisulfate to treat antibiotic wastewater, the catalyst shows excellent catalytic activity and universality, and can efficiently degrade various antibiotic pollutants. The catalytic system takes singlet oxygen as a dominant non-free radical path, and has strong anti-interference capability and high reaction selectivity. According to the method, high-value recycling of the iron sludge is realized, and an efficient solution is provided for antibiotic wastewater treatment.